| There are several color formats and systems available for mixing and specifying colors. Here, we explain three of the most common systems: RGB, CMYK, and Pantone colors.
"RGB" refers to the colors of light that mix to create colors. There are three basic colors of light - red, green and blue. When combined, they create an entire rainbow of colors, either by reflecting off, surfaces or by shining onto surfaces.
In design, RGB color is only used in website design and other designs that are only meant to be seen on your screen (software user interfaces, HTML email, PowerPoint presentations, and TV or movie graphics).
If you send a design to be printed, or print a design that has been created in the RGB color space on your home printer, the printout may not match what you see on the screen - RGB colors on the screen tend to be brighter than what is printed on paper. This is because the colors onscreen are created with light, which adds brightness of its own to the colors. When printing on paper, the light is taken out of the equation. The other reason for this is that an RGB color can be "out of gamut" for CMYK printing, meaning that some of the colors cannot be replicated with printing inks.
CMYK color is also known as four-color printing, full-color printing, or process color printing. CMYK refers to the printing process. In CMYK printing, cyan, magenta, yellow, and black (the "K") inks are printed on the paper as tiny dots (referred to as a "screen" or "line screen"). These dots are so tiny that when they combine visually, they create a rainbow of colors.
This process is used in projects where printing the full range of color is required - in projects with full-color photography or when more than three colors overall are used in the design.
For the production of CMYK printing, digital printing is a more economical choice than full-color press printing. However, in digital printing, the types, colors, and thickness of paper available are often limited, based on the printing machine's specifications and capabilities.
The accuracy limitations of CMYK printing are that the results between different printing methods - digital printing versus press printing - can vary, sometimes greatly, depending on the printer's range, how it is calibrated, and the particular color you are trying to print. Even the results from different digital printers or presses can vary, so color accuracy may be an issue, particularly if you're printing items at different times or with different printers.
There are also colors that cannot be reproduced using the CMYK process - such as metallics, and very bright colors. To expand the color range, additional colors can be added to the mix to increase the range, for six- or seven-color printing. Alternatively, Pantone colors can be used to increase the range - going to five-color (or more) printing to get the color accuracy you need.
Pantone color is also known as the Pantone Matching System, PMS color, or Spot color. This color system is based on a set of inks that are mixed to create solid colors, which are then used to print your materials. These colors fall in a specified range, found in several swatch books produced by the Pantone company. An analogy for this system is the colored paint chips found at the hardware store - you can preview the colors exactly as they will appear in the final print job. Also, since the colors are mixed before printing, instead of being created visually out of tiny dots on the page, they're much more accurate and consistent from print job to print job, as well as to the colors initially intended in the art, than CMYK color.
Pantone colors can be "screened" - a process in which fewer dots of color are used per inch, which makes the color appear lighter. Thus, more colors appear to be being used in a project, without increasing the printing costs or number of colors. Pantone colors are often used on logos or stationery packages (business cards, letterhead, and envelopes), to enable those pieces to be printed on a press using one, two or three colors, which is less expensive than four-color printing (see CMYK color, above). Using Pantone colors on your logo also ensures accurate color representation for your logo in all applications - so that your carefully chosen corporate color will always be the same, regardless of the printing firm you choose to print a particular piece of collateral.
Using the right color format throughout your job will save you money and make your marketing materials look their best.
About the Author
Erin Ferree is a logo, print, and web designer who has been making it easy for small businesses to stand out and to be visible, credible, and memorable for the past nine years. Her web site is elf design.
© 2005 Erin Ferree